As far as i've noticed there's no IPv6 support implemented.
The change to IPv6 is running and more and more people will only get an IPv6 public addresses.
If i want to host an mission on my PC for some friends there's no other way as to let them connect via an additional service like Hamachi or tunngle which slows down the connection. Please implement IPv6 so that i can give them my public IPv6-Address and they can connect to it easily.